PC-Progress Discussion Forums

Please note that we posted almost identical examples (Well-radial) to yours at https://www.pc-progress.com/en/Default.aspx?h3d2-lib-ReservoirBC. What to pay attention to: 1. The z coordinates are the absolute coordinates as used to define the transport domain. If you have the origin of the coordinat...

I provide online support only for the applications of the HYDRUS-1D codes. I do not discuss online other soil physics issues. J.

You need to specify all boundary fluxes as they occurred (i.e., precipitation, irrigation, etc). In addition, you need to associate your solute application with a water flux such so that you get the right amount (i.e., Conc*Flux*Time) into the soil profile.
J.

Solute can enter the soil profile in HYDRUS only as a solute flux. You should use the Cauchy BC and associate your N application with some liquid flux. J.

I'm not sure what you mean. Linear distribution of the pressure head on the boundary representing the well (in the reservoir BC)? What else would you suggest than using the hydrostatic pressure head? J.

You need to copy these files into the HYDRUS folder (where the HYDRUS software is installed). J.

The code was not meant for conditions when the entire profile is fully saturated and simultaneous atmospheric and free drainage BCs. However, we can handle that as well. Try the attached updated code. J. sum(rTop)=137.48 cm (it's negative but to simplify I only keep the absolute values for all resul...

As I wrote above, the surface node should be slightly unsaturated. When you have the VG model with an air entry value of -2 cm, i.e., the surface pressure head should be below -2 to make it unsaturated. hCritA: I do not have more to say in addition to what's written in the help. I would not change t...

I'm pretty sure that "Pulse Duration" works OK if you use this option correct. Note the definition in the User Manual: " Pulse Duration: Time duration of the concentration pulse. Concentrations (flux or resident) along all boundaries, for which no time-variable boundary conditions are specified, are...

What you say is not correct. The units for internal node recharge are [L2/T] (see the figure below) and [L3/T] in 2D and 3D, respectively. J.

Can you provide a schematic? J.

Qp is the pumping rate (positive for removal of water, negative for adding water) ([L2 T–1] or [L3 T–1] for two-dimensional and axisymmetric systems, respectively). See Figure 2.7 in the technical manual or Fig. 1 in: Šimůnek, J., M. Šejna, and M. Th. van Genuchten, New Features of the Version 3 of ...

1. Indeed, the decline from vertical axes is equal to 1, 0, -1 for vertical downward, horizontal, and vertical upward flow. It is the magnitude of gravity. You should be able to run in the inverse mode a project that has gravity=-1. 2. Evaporation is the solution of the surface energy balance equati...

The standard HYDRUS module (but none of the specialized modules, such as HP1 or UnsatChem) has an option to choose if the drainage flux (to horizontal drains, qdrain) is applied at the bottom of the soil profile or vertically distributed along the saturated part of the soil profile. This is obviousl...

Sure, we do not rotate the graph for horizontal flow and use the same ones as for vertical flow. You need to interpret the top in the graph as the left end, and the bottom as the right end. Similarly, top fluxes are the fluxes at the left side and the bottom fluxes at the right side. You can interpr...